Java codes for Lab Classes of Computer Science & Engineering's Courses
import java.awt.EventQueue;
import javax.swing.JFrame;
import java.awt.Toolkit;
import java.awt.Color;
import javax.swing.JTextField;
import java.awt.Font;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.ImageIcon;
import javax.swing.SwingConstants;
import javax.swing.UIManager;
public class Calculator {
private JFrame frmCalculator;
private JTextField txtDisplay;
double firstnum ;
double secondnum ;
double result ;
String operations ;
String answer ;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
Calculator window = new Calculator();
window.frmCalculator.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
public Calculator() {
initialize();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frmCalculator = new JFrame();
frmCalculator.setTitle("Calculator");
frmCalculator.setForeground(Color.DARK_GRAY);
frmCalculator.setIconImage(Toolkit.getDefaultToolkit().getImage("G:\\Programming\\Academic\\3rd semester\\Problems Solution\\Week11\\src\\_2\\2000px-Calculator_icon.svg.png"));
frmCalculator.setResizable(false);
//frmCalculator.setBounds(450, 150, 390, 498);
frmCalculator.setSize(390, 505);
frmCalculator.setLocationRelativeTo(null);
frmCalculator.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frmCalculator.getContentPane().setLayout(null);
txtDisplay = new JTextField();
txtDisplay.setHorizontalAlignment(SwingConstants.RIGHT);
txtDisplay.setForeground(Color.WHITE);
txtDisplay.setBackground(Color.DARK_GRAY);
txtDisplay.setFont(new Font("Tahoma", Font.PLAIN, 45));
txtDisplay.setBounds(0, 0, 384, 93);
frmCalculator.getContentPane().add(txtDisplay);
txtDisplay.setColumns(10);
JButton btn7 = new JButton("7");
btn7.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String EnterNumber = txtDisplay.getText() + btn7.getText() ;
txtDisplay.setText(EnterNumber);
}
});
btn7.setBackground(Color.LIGHT_GRAY);
btn7.setFont(new Font("Tahoma", Font.PLAIN, 35));
btn7.setBounds(0, 92, 91, 76);
frmCalculator.getContentPane().add(btn7);
JButton btn8 = new JButton("8");
btn8.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String EnterNumber = txtDisplay.getText() + btn8.getText() ;
txtDisplay.setText(EnterNumber);
}
});
btn8.setFont(new Font("Tahoma", Font.PLAIN, 35));
btn8.setBackground(Color.LIGHT_GRAY);
btn8.setBounds(90, 92, 100, 76);
frmCalculator.getContentPane().add(btn8);
JButton btn9 = new JButton("9");
btn9.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String EnterNumber = txtDisplay.getText() + btn9.getText() ;
txtDisplay.setText(EnterNumber);
}
});
btn9.setFont(new Font("Tahoma", Font.PLAIN, 35));
btn9.setBackground(Color.LIGHT_GRAY);
btn9.setBounds(189, 92, 96, 76);
frmCalculator.getContentPane().add(btn9);
JButton btnAdd = new JButton("+");
btnAdd.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
firstnum = Double.parseDouble(txtDisplay.getText()) ;
txtDisplay.setText("");
operations = "+" ;
}
});
btnAdd.setFont(new Font("Tahoma", Font.PLAIN, 35));
btnAdd.setBackground(new Color(255, 153, 0));
btnAdd.setBounds(284, 92, 100, 76);
frmCalculator.getContentPane().add(btnAdd);
JButton btn4 = new JButton("4");
btn4.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String EnterNumber = txtDisplay.getText() + btn4.getText() ;
txtDisplay.setText(EnterNumber);
}
});
btn4.setFont(new Font("Tahoma", Font.PLAIN, 35));
btn4.setBackground(Color.LIGHT_GRAY);
btn4.setBounds(0, 168, 91, 76);
frmCalculator.getContentPane().add(btn4);
JButton btn5 = new JButton("5");
btn5.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String EnterNumber = txtDisplay.getText() + btn5.getText() ;
txtDisplay.setText(EnterNumber);
}
});
btn5.setFont(new Font("Tahoma", Font.PLAIN, 35));
btn5.setBackground(Color.LIGHT_GRAY);
btn5.setBounds(90, 168, 100, 76);
frmCalculator.getContentPane().add(btn5);
JButton btn6 = new JButton("6");
btn6.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String EnterNumber = txtDisplay.getText() + btn6.getText() ;
txtDisplay.setText(EnterNumber);
}
});
btn6.setFont(new Font("Tahoma", Font.PLAIN, 35));
btn6.setBackground(Color.LIGHT_GRAY);
btn6.setBounds(189, 168, 96, 76);
frmCalculator.getContentPane().add(btn6);
JButton btnSub = new JButton("-");
btnSub.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
firstnum = Double.parseDouble(txtDisplay.getText()) ;
txtDisplay.setText("");
operations = "-" ;
}
});
btnSub.setFont(new Font("Tahoma", Font.PLAIN, 35));
btnSub.setBackground(new Color(255, 153, 0));
btnSub.setBounds(284, 168, 100, 76);
frmCalculator.getContentPane().add(btnSub);
JButton btn1 = new JButton("1");
btn1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String EnterNumber = txtDisplay.getText() + btn1.getText() ;
txtDisplay.setText(EnterNumber);
}
});
btn1.setFont(new Font("Tahoma", Font.PLAIN, 35));
btn1.setBackground(Color.LIGHT_GRAY);
btn1.setBounds(0, 244, 91, 76);
frmCalculator.getContentPane().add(btn1);
JButton btn2 = new JButton("2");
btn2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String EnterNumber = txtDisplay.getText() + btn2.getText() ;
txtDisplay.setText(EnterNumber);
}
});
btn2.setFont(new Font("Tahoma", Font.PLAIN, 35));
btn2.setBackground(Color.LIGHT_GRAY);
btn2.setBounds(90, 244, 100, 76);
frmCalculator.getContentPane().add(btn2);
JButton btn3 = new JButton("3");
btn3.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String EnterNumber = txtDisplay.getText() + btn3.getText() ;
txtDisplay.setText(EnterNumber);
}
});
btn3.setFont(new Font("Tahoma", Font.PLAIN, 35));
btn3.setBackground(Color.LIGHT_GRAY);
btn3.setBounds(189, 244, 96, 76);
frmCalculator.getContentPane().add(btn3);
JButton btnMul = new JButton("*");
btnMul.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
firstnum = Double.parseDouble(txtDisplay.getText()) ;
txtDisplay.setText("");
operations = "*" ;
}
});
btnMul.setFont(new Font("Tahoma", Font.PLAIN, 35));
btnMul.setBackground(new Color(255, 153, 0));
btnMul.setBounds(284, 244, 100, 76);
frmCalculator.getContentPane().add(btnMul);
JButton btn0 = new JButton("0");
btn0.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String EnterNumber = txtDisplay.getText() + btn0.getText() ;
txtDisplay.setText(EnterNumber);
}
});
btn0.setFont(new Font("Tahoma", Font.PLAIN, 35));
btn0.setBackground(Color.LIGHT_GRAY);
btn0.setBounds(0, 320, 91, 76);
frmCalculator.getContentPane().add(btn0);
JButton btnDot = new JButton(".");
btnDot.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String dot = txtDisplay.getText() ;
txtDisplay.setText(dot+".");
}
});
btnDot.setFont(new Font("Tahoma", Font.PLAIN, 35));
btnDot.setBackground(Color.LIGHT_GRAY);
btnDot.setBounds(90, 320, 100, 76);
frmCalculator.getContentPane().add(btnDot);
JButton btnC = new JButton("C");
btnC.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
txtDisplay.setText(null);
}
});
btnC.setFont(new Font("Tahoma", Font.PLAIN, 35));
btnC.setBackground(Color.LIGHT_GRAY);
btnC.setBounds(189, 320, 96, 76);
frmCalculator.getContentPane().add(btnC);
JButton btnDiv = new JButton("/");
btnDiv.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
firstnum = Double.parseDouble(txtDisplay.getText()) ;
txtDisplay.setText("");
operations = "/" ;
}
});
btnDiv.setFont(new Font("Tahoma", Font.PLAIN, 35));
btnDiv.setBackground(new Color(255, 153, 0));
btnDiv.setBounds(284, 320, 100, 76);
frmCalculator.getContentPane().add(btnDiv);
JButton btnEqual = new JButton("=");
btnEqual.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String answer ;
secondnum = Double.parseDouble(txtDisplay.getText()) ;
if(operations == "+")
{
result = firstnum + secondnum ;
answer = String.format("%.2f", result) ;
txtDisplay.setText(answer);
}
else if(operations == "-")
{
result = firstnum - secondnum ;
answer = String.format("%.2f", result) ;
txtDisplay.setText(answer);
}
else if(operations == "*")
{
result = firstnum * secondnum ;
answer = String.format("%.2f", result) ;
txtDisplay.setText(answer);
}
else if(operations == "/")
{
result = firstnum / secondnum ;
answer = String.format("%.2f", result) ;
txtDisplay.setText(answer);
}
}
});
btnEqual.setFont(new Font("Tahoma", Font.PLAIN, 35));
btnEqual.setBackground(new Color(0, 102, 51));
btnEqual.setBounds(0, 393, 190, 76);
frmCalculator.getContentPane().add(btnEqual);
JButton btnDel = new JButton("Del");
btnDel.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String del = null ;
if(txtDisplay.getText().length() > 0 ) {
StringBuilder strB = new StringBuilder(txtDisplay.getText()) ;
strB.deleteCharAt(txtDisplay.getText().length() - 1 ) ;
del = strB.toString() ;
txtDisplay.setText(del);
}
}
});
btnDel.setFont(new Font("Tahoma", Font.PLAIN, 35));
btnDel.setBackground(new Color(0, 102, 51));
btnDel.setBounds(189, 393, 96, 76);
frmCalculator.getContentPane().add(btnDel);
JButton btnSqrt = new JButton("\u221A");
btnSqrt.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
firstnum = Math.sqrt(Double.parseDouble(txtDisplay.getText())) ;
String ans = String.format("%.2f", firstnum) ;
txtDisplay.setText(ans);
}
});
btnSqrt.setFont(new Font("Tahoma", Font.PLAIN, 35));
btnSqrt.setBackground(new Color(255, 153, 0));
btnSqrt.setBounds(284, 393, 100, 76);
frmCalculator.getContentPane().add(btnSqrt);
}
}
import java.math.BigInteger;
import java.awt.*;
import java.lang.String;
import java.awt.event.*;
import java.applet.Applet;
public class Factorial extends Applet implements ActionListener {
Button n0;
TextField t,tt;
Label l;
public void init(){
Panel pro=new Panel();
pro.setLayout(new GridLayout());
add(new Label("Enter any Integer vlaue"));
add(t =new TextField(20));
add(new Label("Factorial value is:"));
add(tt =new TextField(20));
add(n0 =new Button("Compute"));
n0.addActionListener(this);
}
public void actionPerformed(ActionEvent e){
int j,k;
k=Integer.parseInt(t.getText());
BigInteger f= BigInteger.ONE;
for(j=1;j<=k;j++)
f=f.multiply(BigInteger.valueOf(j));
tt.setText(String.valueOf(f));
repaint();
}
}
import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.ProgressBar;
import javafx.scene.control.ProgressIndicator;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
public class ProgressSample extends Application {
final Float[] values = new Float[] {-1.0f, 0f, 0.6f, 1.0f};
final Label [] labels = new Label[values.length];
final ProgressBar[] pbs = new ProgressBar[values.length];
final ProgressIndicator[] pins = new ProgressIndicator[values.length];
final HBox hbs [] = new HBox [values.length];
@Override
public void start(Stage stage) {
Group root = new Group();
Scene scene = new Scene(root, 300, 250);
stage.setScene(scene);
stage.setTitle("Progress Controls");
for (int i = 0; i < values.length; i++) {
final Label label = labels[i] = new Label();
label.setText("progress:" + values[i]);
final ProgressBar pb = pbs[i] = new ProgressBar();
pb.setProgress(values[i]);
final ProgressIndicator pin = pins[i] = new ProgressIndicator();
pin.setProgress(values[i]);
final HBox hb = hbs[i] = new HBox();
hb.setSpacing(5);
hb.setAlignment(Pos.CENTER);
hb.getChildren().addAll(label, pb, pin);
}
final VBox vb = new VBox();
vb.setSpacing(5);
vb.getChildren().addAll(hbs);
scene.setRoot(vb);
stage.show();
}
public static void main(String[] args) {
launch(args);
}
}
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.text.html.*;
public class SwingProgressBar{
final static int interval = 1000;
int i;
JLabel label;
JProgressBar pb;
Timer timer;
JButton button;
public SwingProgressBar() {
JFrame frame = new JFrame("Swing Progress Bar");
button = new JButton("Start");
button.addActionListener(new ButtonListener());
pb = new JProgressBar(0, 20);
pb.setValue(0);
pb.setStringPainted(true);
label = new JLabel("habibcse009.net");
JPanel panel = new JPanel();
panel.add(button);
panel.add(pb);
JPanel panel1 = new JPanel();
panel1.setLayout(new BorderLayout());
panel1.add(panel, BorderLayout.NORTH);
panel1.add(label, BorderLayout.CENTER);
panel1.setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));
frame.setContentPane(panel1);
frame.pack();
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create a timer.
timer = new Timer(interval, new ActionListener() {
public void actionPerformed(ActionEvent evt) {
if (i == 20){
Toolkit.getDefaultToolkit().beep();
timer.stop();
button.setEnabled(true);
pb.setValue(0);
String str = "<html>" + "<font color=\"#FF0000\">" + "<b>" + "Downloading completed." + "</b>" + "</font>" + "</html>";
label.setText(str);
}
i = i + 1;
pb.setValue(i);
}
});
}
class ButtonListener implements ActionListener {
public void actionPerformed(ActionEvent ae) {
button.setEnabled(false);
i = 0;
String str = "<html>" + "<font color=\"#008000\">" + "<b>" + "Downloading is in process......." + "</b>" + "</font>" + "</html>";
label.setText(str);
timer.start();
}
}
public static void main(String[] args) {
SwingProgressBar spb = new SwingProgressBar();
}
}
import java.awt.event.*;
import javax.swing.*;
public class March extends JFrame implements ActionListener{
JTextArea ta;
JButton b1,b2;
March() {
super("Word Character Counter-JavaTpoint");
ta=new JTextArea();
ta.setBounds(50,50,300,200);
b1=new JButton("Word");
b1.setBounds(50,300,100,30);
b2=new JButton("Character");
b2.setBounds(180,300,100,30);
b1.addActionListener(this);
b2.addActionListener(this);
add(b1);add(b2);add(ta);
setSize(400,400);
setLayout(null);
setVisible(true);
}
public void actionPerformed(ActionEvent e) {
String text=ta.getText();
if(e.getSource()==b1) {
String words[]=text.split("\\s");
JOptionPane.showMessageDialog(this,"Total words:"+words.length);
}
if(e.getSource()==b2) {
JOptionPane.showMessageDialog(this,"Total Characters with space:"+text.length());
}}
public static void main(String[] args) {
new March();
}
}
